/*
moxl - Modular XML Library
Copyright (c) 2007, Malcolm Sparks

This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
*/
package moxl.compare;

import moxl.dom.MoxlElement;

public class ElementChildElementsCountDifference implements DocumentDifference
{
	private final MoxlElement element1;
	private final MoxlElement element2;

	public ElementChildElementsCountDifference(MoxlElement element1, MoxlElement element2)
	{
		this.element1 = element1;
		this.element2 = element2;
	}

	@Override
	public String toString()
	{
		StringBuilder builder = new StringBuilder();
		builder.append("Elements are different: ");
		builder.append(element1.toString());
		builder.append(" has ");
		builder.append(cardinality(element1.getChildElements().size()));
		builder.append(" versus ");
		builder.append(element2.toString());
		builder.append(" that has ");
		builder.append(cardinality(element2.getChildElements().size()));
		return builder.toString();
	}

	private String cardinality(int number)
	{
		switch (number)
		{
		case 0:
			return "no elements";
		case 1:
			return "one element";
		case 2:
			return "two elements";
		default:
			return number + " elements";
		}
	}
}
